基于改进比例控制的STATCOM/BESS直流侧功率动态分配方法  

Dynamic Allocation Method of DC Side Power Based on Improved Ratio Control for STATCOM/BESS

作　　者：李宁宁[1] 王建赜[2] 纪延超[2] 刘一琦[2] 

机构地区：[1]东北农业大学电气与信息学院,哈尔滨150030 [2]哈尔滨工业大学电气工程及自动化学院,哈尔滨150001

出　　处：《高电压技术》2016年第1期112-120,共9页High Voltage Engineering

摘　　要：在静止无功补偿器的直流侧并联蓄电池储能系统,可以解决微电网中因可再生能源发电波动性引起的供电质量降低的问题,当静止同步补偿器直流侧并联多个蓄电池储能系统时,为了均衡直流侧各个蓄电池储能系统的功率,提出了一种基于改进比例控制的直流侧功率动态分配方法。该方法以各个储能单元的荷电状态平均数为控制目标,对各个储能单元实时的So C采用一种可变比例系数控制,其控制量决定各个储能单元功率分配,可以实现So C较高的模块在放电时输出较多功率。同时So C较低的模块在充电时吸收较多功率,还可以在系统只输出无功功率时实现So C较高的模块给So C较低的模块充电。结果表明:在动态功率均衡控制中通过在线改变比例系数,可以有效地提高模块的利用率,快速完成模块之间的功率均衡。最后,仿真和实验结果验证了所提控制方法的正确性。The degradation of power quality induced by the intermittence of renewable energy generation in microgrids can be solved by using parallel battery energy storage system （BESS） at the DC side. Consequently, when multiple BESSs are simultaneously connected at the DC side of static synchronous compensator （STATCOM）, a DC side dynamic power sharing method based on improved proportional control is proposed in order to balance the power of each BESS. The state-of-charge （SoC） of each BESS is selected as the control objective in the proposed method, and proportional control with variable coefficients is employed to determine the power dispatch among multiple BESSs. It is achieved that the module with higher SoC delivers more power, while the one with lower SoC absorbs more power. Meanwhile, when the system only generates reactive power, the module with higher SoC can charge the one with lower SoC. With on-line dy- namic adjustment of the proportional term, fast dynamic power dispatch can be achieved, which can further enhance the utilization rate of the module. The correctness of the proposed control method is verified by using simulation and experi- mental tests.

关 键 词：可变比例控制 功率均衡 SOC STATCOM 蓄电池储能系统 微电网 

分 类 号：TM761[电气工程—电力系统及自动化]